The Kingdom of León was a medieval state in the northwest of the Iberian Peninsula, established in the 10th century. It emerged from the earlier Kingdom of Asturias, which had successfully resisted Muslim conquests. León became a center of Christian power and culture, playing a crucial role in the Reconquista, the effort to reclaim territory from Muslim rule. During its height, the Kingdom of León was known for its strong monarchy and vibrant cities, such as León and Burgos. It produced important legal codes, like the Fuero de León, which helped shape medieval Spanish law. The kingdom eventually merged with the Kingdom of Castile, influencing the future of Spain.